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How can I test CD-R and CD-RW media ?

Formerly I used a removable Hard-Drive for all my backup's but now I've got a CD-RW drive I want to use CD-RW's for my back-ups.

One thing that bothers me is that I know that given time and enough erasures that the media may become unreliable. But I don't have any way to test the current state of the media so Iím assuming that the first Iíll know about this is when I canít read a (possibly irreplaceable) file .

Yeah, I agree that CD-R's are cheap enough but I prefer CD-RW for backup because you can rotate them and don't end up with masses of old backup disks to store or destroy.

What I'm looking for is something like a program that can read every sector and report the numbers of times that ECC is needed. ie something that will show if a disk is deteriorating (or even bad from new if it's a cheap CD-RW disk).